<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>内部CSS</title>
  <style>
    body{
      background-color: linen;
    }
    h1{
      text-align: center;
        margin-left: 40px;
    }
  </style>
</head>
<body>
<h1>内部CSS</h1>
<p>内部CSS</p>
</body>
</html>